...
diff --git a/coders/ghostscript-private.h b/coders/ghostscript-private.h
index 022cb74..5c16a9d 100644
--- a/coders/ghostscript-private.h
+++ b/coders/ghostscript-private.h
@@ -16,6 +16,8 @@
 #ifndef MAGICK_GHOSTSCRIPT_BUFFER_PRIVATE_H
 #define MAGICK_GHOSTSCRIPT_BUFFER_PRIVATE_H
 
+#include "coders/bytebuffer-private.h"
+
 #if defined(MAGICKCORE_GS_DELEGATE) || defined(MAGICKCORE_WINDOWS_SUPPORT)
 static int MagickDLLCall GhostscriptDelegateMessage(void *handle,
   const char *message,int length)